what are u going to use for a lift pump? something external or in tank?

The OE Duramax fuel system does not have a lift pump, just the injection pump. This is a poor design and we will be adding an Airdog fuel system. We run these on all of our trucks and highly recommend them.

The OE Duramax fuel system does not have a lift pump, just the injection pump. This is a poor design and we will be adding an Airdog fuel system. We run these on all of our trucks and highly recommend them.

Just curious why the factory CP3 injection pump is a poor design? It seems to work great and the factory dmaxes produce great power. However, I can definitely see the advantages to an aftermarket lift pump like the Airdog.

Just curious why the factory CP3 injection pump is a poor design? It seems to work great and the factory dmaxes produce great power. However, I can definitely see the advantages to an aftermarket lift pump like the Airdog.

The CP3 is a good unit. The fuel system running to the CP3 is a bad design. It runs from the motor to the tank under vacuum. It does not filter fuel very good and has poor water separation. These are all the reasons the AirDog fuel system is highly recommended and will be used.